JP4648131B2 - Active anti-vibration support device - Google Patents

Description

The present invention includes an elastic body that receives a load of a vibrating body, a liquid chamber in which the elastic body forms at least a part of a wall surface, an actuator that operates by receiving a supply of current according to a vibration state of the vibrating body, and an actuator. A movable member that reciprocates to change the volume of the liquid chamber, and the actuator is disposed in an annular yoke, a coil wound around the outer periphery of the yoke, and reciprocally movable on the inner periphery of the yoke. The present invention relates to an active vibration isolating support device including a movable core connected to a movable member.

Such an active vibration isolating support device is known, for example, from Patent Document 1 below. In the actuator of this active vibration isolating support device, the height of the upper end of the yoke having a coil wound around the outer periphery is substantially equal to the height of the upper end of the armature supported so as to be movable up and down on the inner periphery of the yoke. The movable member connected to the amateur is disposed at a position higher than the upper end of the yoke.
JP 2004-293601A

  By the way, in order to exhibit an effective anti-vibration function in the active anti-vibration support device, it is necessary to sufficiently secure the output of the actuator. In order to increase the output of the actuator, it is sufficient to increase the number of turns of the coil, but simply increasing the number of turns of the coil increases the size of the actuator, resulting in an increase in the size of the active vibration isolating support device. There's a problem.

  The present invention has been made in view of the above circumstances, and an object thereof is to increase the output of an actuator by increasing the number of turns of a coil while avoiding an increase in the size of an actuator of an active vibration-proof support device.

To achieve the above object, according to the first aspect of the present invention, an elastic body that receives a load of the vibrating body, a liquid chamber in which the elastic body forms at least a part of a wall surface, and a vibration state of the vibrating body An actuator that operates upon receiving a supply of current in accordance with the motor, and a movable member that reciprocates by the actuator to change the volume of the liquid chamber. The actuator is wound around an annular yoke and the outer periphery of the yoke In the active vibration isolating support device including a coil and a movable core that is disposed on the inner periphery of the yoke so as to be reciprocally movable and connected to the movable member, the yoke is movable so as to support the movable core so as to be reciprocally movable. A core support part, and a taper part extending upward from the upper end of the movable core support part in a taper shape, and the coil is wound over both the movable core support part and the taper part. Together with the upper end of the movable member which is disposed on the inner peripheral portion of said yoke active vibration isolation support system, characterized in that located substantially flush with the upper end of the yoke is proposed.

According to the second aspect of the present invention, in addition to the structure of the first aspect , the support member is provided with a support ring that reciprocally supports the movable member on the actuator case, and the support ring includes the taper of the yoke. An active vibration isolating support device is proposed which is positioned by an equal-diameter portion extending upward from the upper end of the portion.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, an active vibration isolating support device is characterized in that the support ring forms a magnetic circuit in cooperation with the yoke. Proposed.

The second elastic body support ring 15 of the embodiment corresponds to the support ring of the present invention, the first elastic body 19 of the embodiment corresponds to the elastic body of the present invention, and the first and second liquid chambers of the embodiment. 30 and 31 corresponds to the liquid chamber of the present invention, the bobbin-less coil 46 of the embodiment you corresponds to the coil of the present invention.

According to the configuration of the first aspect, the actuator of the active vibration isolating support device is connected to the movable member by being arranged so as to reciprocate on the inner periphery of the yoke, the coil wound around the outer periphery of the yoke. and a movable core that is, when energized and deenergized coil movable core against the yoke the movable member is driven by the relative movement. The yoke has a movable core support part that supports the movable core so as to be able to reciprocate, and a taper part that extends upward from the upper end of the movable core support part in a tapered shape, and the coil is a movable core support part. Since the coil is wound over both the taper and the taper, the actuator output can be increased by increasing the number of turns of the coil that can be wound around the outer circumference of the yoke. Then, the actuator can be reduced in size. In addition, since the upper end of the movable member disposed on the inner peripheral portion of the yoke is located at substantially the same height as the upper end of the yoke, the vertical dimension of the taper portion of the yoke is sufficiently secured to increase the number of turns of the coil. However, it is possible to prevent the movable member from interfering with the yoke.

According to the configuration of the second aspect, the support ring that supports the movable member on the actuator case so as to reciprocate is positioned by the equal-diameter portion that extends upward from the upper end of the tapered portion of the yoke. It is not necessary to form a bent portion in the support ring for fixing. This simplifies the shape of the support ring and makes it difficult to interfere with the yoke, thereby further increasing the number of turns of the coil around the yoke.

According to the third aspect of the present invention, since the support ring that holds the movable member in the actuator case forms a magnetic circuit in cooperation with the yoke, the magnetic circuit can be used by utilizing the support ring without increasing the size or thickness of the yoke. Can be configured.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an active vibration isolating support device, FIG. 2 is an enlarged view of part 2 of FIG. 1, and FIG. It is a flowchart explaining the effect | action of a support apparatus. In addition, the upper direction in this specification shall point out the upper side of the paper surface in FIG.

  As shown in FIGS. 1 and 2, an active anti-vibration support device M (active control mount) used for elastically supporting an automobile engine on a body frame is substantially axisymmetric with respect to an axis L. A substantially cup-shaped actuator case having an open upper surface between a flange portion 11a at the lower end of the substantially cylindrical upper housing 11 and a flange portion 12a at the upper end of the generally cylindrical lower housing 12. The outer peripheral flange portion 13a, the outer peripheral portion of the annular first elastic body support ring 14, and the outer peripheral portion of the annular second elastic body support ring 15 are overlapped and joined by caulking. At this time, an annular floating rubber 17 is interposed between the upper portion of the actuator case 13 and the inner surface of the second elastic support ring 15.

  The lower end and the upper end of the first elastic body 19 formed of thick rubber are joined to the first elastic body support ring 14 and the first elastic body support boss 18 disposed on the axis L by vulcanization adhesion. Is done. A diaphragm support boss 20 is fixed to the upper surface of the first elastic body support boss 18 with bolts 21, and the outer peripheral portion of the diaphragm 22 joined to the diaphragm support boss 20 by vulcanization adhesion is added to the upper housing 11. Joined by sulfur adhesion. An engine mounting portion 20a integrally formed on the upper surface of the diaphragm support boss 20 is fixed to an engine (not shown). In addition, the vehicle body attachment portion 12b at the lower end of the lower housing 12 is fixed to a vehicle body frame (not shown).

  A flange portion 23a at the lower end of the stopper member 23 is coupled to the flange portion 11b at the upper end of the upper housing 11 with bolts 24 and nuts 25 and so on. The engine mounting portion 20a that protrudes from the upper surface of the upper and lower surfaces faces each other so as to be capable of contacting. When a large load is input to the active vibration isolating support device M, the engine mounting portion 20a abuts against the stopper rubber 26, thereby suppressing excessive displacement of the engine.

  The outer peripheral portion of the second elastic body 27 formed of a film-like rubber is joined to the second elastic body support ring 15 by vulcanization adhesion, and the movable member 28 is added so as to be embedded in the central portion of the second elastic body 27. Joined by sulfur adhesion. A disk-shaped partition wall member 29 is fixed between the upper surface of the second elastic body support ring 15 and the outer periphery of the first elastic body 19, and the first partition partitioned by the partition wall member 29 and the first elastic body 19. The liquid chamber 30 and the second liquid chamber 31 partitioned by the partition member 29 and the second elastic body 27 communicate with each other through a communication hole 29 a formed at the center of the partition member 29.

  An annular communication path 32 is formed between the first elastic body support ring 14 and the upper housing 11, and one end of the communication path 32 communicates with the first liquid chamber 30 through the communication hole 33. The other end communicates with the third liquid chamber 35 defined by the first elastic body 19 and the diaphragm 22 through the communication hole 34.

  Next, the structure of the actuator 41 that drives the movable member 28 will be described.

  The fixed core 42, the coil assembly 43, and the yoke 44 are sequentially attached to the inside of the actuator case 13 from the bottom to the top. The coil assembly 43 includes a bobbinless coil 46 disposed between the fixed core 42 and the yoke 44, and a coil cover 47 that covers the outer periphery of the bobbinless coil 46. The coil cover 47 is integrally formed with a connector 48 that extends through the openings 13b and 12c formed in the actuator case 13 and the lower housing 12 and extends to the outside. A seal member 50 is disposed between the lower surface of the bobbinless coil 46 and the upper surface of the fixed core 42.

  A thin cylindrical bearing member 51 is fitted to the inner peripheral surface of the movable core support portion 44a of the yoke 44 so as to be slidable in the vertical direction. The upper flange of the bearing member 51 is bent inward in the radial direction. 51a is formed, and a lower flange 51b bent outward in the radial direction is formed at the lower end. A set spring 52 is disposed in a compressed state between the lower flange 51 b and the lower end of the movable core support portion 44 a of the yoke 44, and the lower flange 51 b is fixed via the elastic body 53 by the elastic force of the set spring 52. The bearing member 51 is supported by the yoke 44 by pressing against the upper surface of the core 42.

  A substantially cylindrical movable core 54 is fitted to the inner peripheral surface of the bearing member 51 so as to be slidable up and down. A rod 55 extending downward from the center of the movable member 28 penetrates the center of the movable core 54 loosely, and a nut 56 is fastened to the lower end thereof. A set spring 58 in a compressed state is disposed between a spring seat 57 provided on the upper surface of the movable core 54 and the lower surface of the movable member 28, and the movable core 54 is pressed against the nut 56 by the elastic force of the set spring 58. Fixed. In this state, the lower surface of the movable core 54 and the upper surface of the fixed core 42 face each other via the conical air gap g. The rod 55 and the nut 56 are loosely fitted in an opening 42 a formed at the center of the fixed core 42, and the opening 42 a is closed by a plug 60 through a seal member 59. These seal members 49, 50, 59 prevent water and dust from entering the sealed space 61 of the actuator 41 from the openings 13 b, 12 c, 42 a formed in the actuator case 13, the lower housing 12 and the fixed core 42. it can.

  An annular yoke 44 around which the bobbinless coil 46 is wound is formed with a tapered portion 44b extending upward from the upper end of the actuator support portion 44a while extending in a tapered shape, and a constant from the upper end of the tapered portion 44b. An equal-diameter portion 44c extending upward in diameter is provided, and an inner peripheral flange portion 15a of the second elastic body support ring 15 is fitted to the inner peripheral surface of the equal-diameter portion 44c. The upper end of the equal diameter portion 44 c of the yoke 44 reaches the vicinity of the upper end of the movable member 28, and therefore at least a part of the movable member 28 is disposed on the inner peripheral portion of the yoke 44.

  The electronic control unit U, to which a crank pulse sensor Sa for detecting a crank pulse output with the rotation of the crankshaft of the engine is connected, controls energization to the actuator 41 of the active vibration-proof support device M. The engine crank pulse is output 24 times per revolution of the crankshaft, that is, once every 15 ° of the crank angle.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When low-frequency engine shake vibration is generated while the vehicle is running, the first elastic body 19 is deformed by a load input from the engine via the diaphragm support boss 20 and the first elastic body support boss 18, and the first liquid When the volume of the chamber 30 changes, the liquid goes back and forth between the first liquid chamber 30 and the third liquid chamber 35 connected via the communication path 32. When the volume of the first liquid chamber 30 is enlarged / reduced, the volume of the third liquid chamber 35 is reduced / expanded accordingly, but the volume change of the third liquid chamber 35 is absorbed by the elastic deformation of the diaphragm 22. At this time, the shape and size of the communication path 32 and the spring constant of the first elastic body 19 are set so as to exhibit a low spring constant and a high damping force in the frequency region of the engine shake vibration. The vibration transmitted to can be effectively reduced.

  In the frequency region of the engine shake vibration, the actuator 41 is kept in an inoperative state.

  When vibration having a higher frequency than the engine shake vibration, that is, vibration during idling or vibration during cylinder deactivation caused by rotation of the crankshaft of the engine occurs, the first liquid chamber 30 and the third liquid chamber 35 are connected. Since the liquid in the communication path 32 is in a stick state and cannot exhibit the anti-vibration function, the actuator 41 is driven to exhibit the anti-vibration function.

  The electronic control unit U controls the energization to the bobbinless coil 46 based on the signal from the crank pulse sensor Sa in order to operate the actuator 41 of the active vibration isolating support device M to exhibit the vibration isolating function.

That is, in the flowchart of FIG. 3, first, in step S1, a crank pulse output from the crank pulse sensor Sa every 15 ° of crank angle is read, and in step S2, the read crank pulse is used as a reference crank pulse (specific cylinder). And the time interval of the crank pulse is calculated. In the next step S3, the crank angular velocity ω is calculated by dividing the crank angle of 15 ° by the time interval of the crank pulse, and in step S4, the crank angular velocity ω is time-differentiated to calculate the crank angular acceleration dω / dt. In the following step S5, the torque Tq around the engine crankshaft is set as I, and the moment of inertia around the engine crankshaft is set as I.
Tq = I × dω / dt
Calculate by This torque Tq is zero assuming that the crankshaft is rotating at a constant angular velocity ω, but in the expansion stroke, the angular velocity ω increases due to acceleration of the piston, and in the compression stroke, the angular velocity ω decreases due to deceleration of the piston. Since the crank angular acceleration dω / dt is generated, a torque Tq proportional to the crank angular acceleration dω / dt is generated.

  In the subsequent step S6, the maximum value and the minimum value of the temporally adjacent torque are determined, and in step S7, the active vibration isolation support device M that supports the engine as a deviation between the maximum value and the minimum value of the torque, that is, the amount of torque fluctuation. The amplitude at the position of is calculated. In step S8, the duty waveform and timing (phase) of the current applied to the bobbinless coil 46 of the actuator 41 are determined.

  Accordingly, when the engine moves downward with respect to the vehicle body frame and the first elastic body 19 is deformed downward to reduce the volume of the first liquid chamber 30, the bobbinless coil 46 of the actuator 41 is synchronized with the timing. Is excited, a magnetic field is formed in the magnetic path formed by the movable core 54, the yoke 44, the second elastic body support ring 15, the actuator case 13, and the fixed core 42, and the movable core 54 is fixed by the attractive force generated in the air gap g. The second elastic body 27 is moved downward toward the core 42 and pulled by the movable member 28 connected to the movable core 54 via the rod 55, so that the second elastic body 27 is deformed downward. As a result, since the volume of the second liquid chamber 31 increases, the liquid in the first liquid chamber 30 compressed by the load from the engine flows into the second liquid chamber 31 through the communication hole 29a of the partition wall member 29. The load transmitted from the engine to the vehicle body frame can be reduced. Since the second elastic support ring 15 constitutes a part of the magnetic path, the yoke 44 can be made smaller or thinner by that amount.

  Subsequently, when the engine moves upward with respect to the vehicle body frame and the first elastic body 19 is deformed upward and the volume of the first liquid chamber 30 increases, the bobbinless coil 46 of the actuator 41 is adjusted in accordance with the timing. When the demagnetization is performed, the attracting force generated in the air gap g disappears and the movable core 54 can move freely. Therefore, the second elastic body 27 deformed downward is restored upward by its own elastic restoring force. As a result, since the volume of the second liquid chamber 31 decreases, the liquid in the second liquid chamber 31 passes through the communication hole 29a of the partition wall member 29 and flows into the first liquid chamber 30, and the engine is in contact with the vehicle body frame. It can be allowed to move upward.

  In this way, by exciting and demagnetizing the bobbinless coil 46 of the actuator 41 according to the engine vibration cycle, an active damping force for preventing the engine vibration from being transmitted to the vehicle body frame is generated. Can do.

  By the way, in order for the active vibration-proof support device M to exhibit a sufficient vibration-proof function, it is necessary to increase the output of the actuator 41. To that end, it is necessary to increase the coil cross-sectional area of the bobbinless coil 46, that is, the number of turns. There is. However, if the number of turns of the bobbinless coil 46 is increased, the size of the actuator 41 increases, and as a result, there is a problem that the active vibration-proof support device M is increased in size. Therefore, the active vibration isolating support device M of the present embodiment effectively uses the dead space in the sealed space 61 to increase the coil cross-sectional area of the bobbinless coil 46.

  That is, the taper portion 44b and the equal diameter portion 44c protrude upward from the movable core support portion 44a of the yoke 44, and a part of the bobbinless coil 46 is disposed radially outside the taper portion 44b and the equal diameter portion 44c. The dead space existing in the vicinity of the outer periphery of the second elastic body 27 connected to the movable member 28 can be effectively used, and the number of turns of the bobbinless coil 46 can be increased. Moreover, since the tapered portion 44b of the yoke 44 is expanded toward the movable member 28, the problem of interference with the movable member 28 because the yoke 44 is extended upward can be solved.

  If the number of turns of the bobbinless coil 46 is maintained as before, the size of the actuator 41 can be reduced to reduce the size of the active vibration isolating support device M as a whole.

  In addition, the conventional active vibration isolating support device described in Patent Document 1 has a movable member brought into contact with the inner periphery of the actuator case via the second elastic body and the second elastic body support ring, thereby moving the movable member. Since it is positioned in the radial direction, it is necessary to bend the inner peripheral portion of the second elastic body support ring to contact the inner peripheral surface of the actuator case, and the number of turns of the bobbinless coil is limited by the bent portion. It was.

  However, in this embodiment, the yoke 44 of the actuator 41 positioned in contact with the inner peripheral surface of the actuator case 13 is extended to position the second elastic body support ring 15 (and hence the movable member 28) in the radial direction. Therefore, the number of turns of the bobbinless coil 46 can be increased without the need for the bent portion of the second elastic body support ring 15.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the yoke 44 of the first embodiment, the equal-diameter portion 44c is supported by being fitted to the second elastic body support ring 15. However, the yoke 44 of the second embodiment is radially outward from the upper end of the equal-diameter portion 44c. An extending flange portion 44d is provided, and the front end of the flange portion 44d is fitted to and supported by the actuator case 13.

  According to the second embodiment, since the magnetic path hardly passes through the second elastic support ring 15, the magnetic path is shortened and the magnetic resistance is reduced. Moreover, since the yoke 44 is directly supported by the actuator case 13, the positioning accuracy is improved.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The radially outer end of the bobbinless coil 46 of the first embodiment protrudes radially outward from the radially outer end of the yoke 44 (see FIG. 2), but the diameter of the bobbinless coil 46 of the third embodiment. The outer end in the direction is aligned with the outer end in the radial direction of the yoke 44. Therefore, according to the third embodiment, the outer diameter of the actuator 41 can be reduced as compared with the first embodiment.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the actuator 41 according to the embodiment includes the bobbinless coil 46, but may include a coil with a bobbin.

1 is a longitudinal sectional view of an active vibration isolating support device according to a first embodiment. 2 enlarged view of FIG. Flowchart explaining operation of active vibration isolating support device The figure corresponding to the said FIG. 2 based on 2nd Example. The figure corresponding to the said FIG. 2 based on 3rd Example.

15 Second elastic support ring ( support ring )
19 First elastic body (elastic body)
28 Movable member 30 First liquid chamber (liquid chamber)
31 Second liquid chamber (liquid chamber)
41 actuator 44 yoke 44a movable core supporting portion
44b taper
44c equal diameter part 46 bobbinless coil (coil)
54 movable core

Claims (3)

An elastic body (19) that receives the load of the vibrating body;
A liquid chamber (30, 31) in which the elastic body (19) forms at least a part of the wall surface;
An actuator (41) that operates by receiving a supply of current according to the vibration state of the vibrating body ;
A movable member (28) that reciprocates by an actuator (41) to change the volume of the liquid chamber (30, 31),
The actuator (41) includes an annular yoke (44), a coil (46) wound around the outer periphery of the yoke (44), and an inner periphery of the yoke (44) so as to be reciprocally movable. An active anti-vibration support device comprising a movable core (54) connected to (28),
The yoke (44) extends upward while expanding in a tapered shape from the upper end of the movable core support (44a), and a movable core support (44a) that supports the movable core (54) so as to reciprocate. A taper portion (44b),
The coil (46) is wound over both the movable core support part (44a) and the taper part (44b), and the movable member is disposed on the inner peripheral part of the yoke (44). (28) The upper end of the yoke (44) is positioned at substantially the same height as the upper end of the yoke (44).   The movable member (28) is provided with a support ring (15) that reciprocally supports the actuator case (13), and the support ring (15) extends from an upper end of the tapered portion (44b) of the yoke (44). The active vibration isolating support device according to claim 1, characterized in that the active vibration isolating support device is positioned by an equal diameter portion (44c) extending upward.   3. The active vibration isolating support device according to claim 2, wherein the support ring (15) forms a magnetic circuit in cooperation with the yoke (44).

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